se·lec·tion 
(sĭ-lĕkshən)
(sĭ-lĕkshən)n.
1. The act of selecting something: looked at the pears and made a careful selection.
2. One that is selected, such as a literary or musical text chosen for reading or performance: For her last selection she sang an old favorite.
3.
a. A carefully chosen or representative collection of people or things: a book containing a selection of the author's best work.
b. A range of things from which one can make a choice: a store with a wide selection of magazines. See Synonyms at choice.
4. Biology A natural or artificial process that involves the survival and reproduction of some kinds of organisms instead of others (because they have traits that are better adapted to the environment or that are preferred by a breeder, for example) and results in changes in the traits of a population or species.
se·lection·al (-shə-nəl) adj.